drivers/hid/hid-lg4ff.c

   1 /*
   2  *  Force feedback support for Logitech Gaming Wheels
   3  *
   4  *  Including G27, G25, DFP, DFGT, FFEX, Momo, Momo2 &
   5  *  Speed Force Wireless (WiiWheel)
   6  *
   7  *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26
  27 #include <linux/input.h>
  28 #include <linux/usb.h>
  29 #include <linux/hid.h>
  30
  31 #include "usbhid/usbhid.h"
  32 #include "hid-lg.h"
  33 #include "hid-ids.h"
  34
  35 #define DFGT_REV_MAJ 0x13
  36 #define DFGT_REV_MIN 0x22
  37 #define DFP_REV_MAJ 0x11
  38 #define DFP_REV_MIN 0x06
  39 #define FFEX_REV_MAJ 0x21
  40 #define FFEX_REV_MIN 0x00
  41 #define G25_REV_MAJ 0x12
  42 #define G25_REV_MIN 0x22
  43 #define G27_REV_MAJ 0x12
  44 #define G27_REV_MIN 0x38
  45
  46 #define to_hid_device(pdev) container_of(pdev, struct hid_device, dev)
  47
  48 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, u16 range);
  49 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range);
  50 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf);
  51 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count);
  52
  53 static DEVICE_ATTR(range, S_IRWXU | S_IRWXG | S_IRWXO, lg4ff_range_show, lg4ff_range_store);
  54
  55 struct lg4ff_device_entry {
  56         __u32 product_id;
  57         __u16 range;
  58         __u16 min_range;
  59         __u16 max_range;
  60 #ifdef CONFIG_LEDS_CLASS
  61         __u8  led_state;
  62         struct led_classdev *led[5];
  63 #endif
  64         struct list_head list;
  65         void (*set_range)(struct hid_device *hid, u16 range);
  66 };
  67
  68 static const signed short lg4ff_wheel_effects[] = {
  69         FF_CONSTANT,
  70         FF_AUTOCENTER,
  71         -1
  72 };
  73
  74 struct lg4ff_wheel {
  75         const __u32 product_id;
  76         const signed short *ff_effects;
  77         const __u16 min_range;
  78         const __u16 max_range;
  79         void (*set_range)(struct hid_device *hid, u16 range);
  80 };
  81
  82 static const struct lg4ff_wheel lg4ff_devices[] = {
  83         {USB_DEVICE_ID_LOGITECH_WHEEL,       lg4ff_wheel_effects, 40, 270, NULL},
  84         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL,  lg4ff_wheel_effects, 40, 270, NULL},
  85         {USB_DEVICE_ID_LOGITECH_DFP_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_dfp},
  86         {USB_DEVICE_ID_LOGITECH_G25_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  87         {USB_DEVICE_ID_LOGITECH_DFGT_WHEEL,  lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  88         {USB_DEVICE_ID_LOGITECH_G27_WHEEL,   lg4ff_wheel_effects, 40, 900, hid_lg4ff_set_range_g25},
  89         {USB_DEVICE_ID_LOGITECH_MOMO_WHEEL2, lg4ff_wheel_effects, 40, 270, NULL},
  90         {USB_DEVICE_ID_LOGITECH_WII_WHEEL,   lg4ff_wheel_effects, 40, 270, NULL}
  91 };
  92
  93 struct lg4ff_native_cmd {
  94         const __u8 cmd_num;     /* Number of commands to send */
  95         const __u8 cmd[];
  96 };
  97
  98 struct lg4ff_usb_revision {
  99         const __u16 rev_maj;
 100         const __u16 rev_min;
 101         const struct lg4ff_native_cmd *command;
 102 };
 103
 104 static const struct lg4ff_native_cmd native_dfp = {
 105         1,
 106         {0xf8, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00}
 107 };
 108
 109 static const struct lg4ff_native_cmd native_dfgt = {
 110         2,
 111         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 112          0xf8, 0x09, 0x03, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 113 };
 114
 115 static const struct lg4ff_native_cmd native_g25 = {
 116         1,
 117         {0xf8, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00}
 118 };
 119
 120 static const struct lg4ff_native_cmd native_g27 = {
 121         2,
 122         {0xf8, 0x0a, 0x00, 0x00, 0x00, 0x00, 0x00,      /* 1st command */
 123          0xf8, 0x09, 0x04, 0x01, 0x00, 0x00, 0x00}      /* 2nd command */
 124 };
 125
 126 static const struct lg4ff_usb_revision lg4ff_revs[] = {
 127         {DFGT_REV_MAJ, DFGT_REV_MIN, &native_dfgt},     /* Driving Force GT */
 128         {DFP_REV_MAJ,  DFP_REV_MIN,  &native_dfp},      /* Driving Force Pro */
 129         {G25_REV_MAJ,  G25_REV_MIN,  &native_g25},      /* G25 */
 130         {G27_REV_MAJ,  G27_REV_MIN,  &native_g27},      /* G27 */
 131 };
 132
 133 /* Recalculates X axis value accordingly to currently selected range */
 134 static __s32 lg4ff_adjust_dfp_x_axis(__s32 value, __u16 range)
 135 {
 136         __u16 max_range;
 137         __s32 new_value;
 138
 139         if (range == 900)
 140                 return value;
 141         else if (range == 200)
 142                 return value;
 143         else if (range < 200)
 144                 max_range = 200;
 145         else
 146                 max_range = 900;
 147
 148         new_value = 8192 + mult_frac(value - 8192, max_range, range);
 149         if (new_value < 0)
 150                 return 0;
 151         else if (new_value > 16383)
 152                 return 16383;
 153         else
 154                 return new_value;
 155 }
 156
 157 int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 158                              struct hid_usage *usage, __s32 value, struct lg_drv_data *drv_data)
 159 {
 160         struct lg4ff_device_entry *entry = drv_data->device_props;
 161         __s32 new_value = 0;
 162
 163         if (!entry) {
 164                 hid_err(hid, "Device properties not found");
 165                 return 0;
 166         }
 167
 168         switch (entry->product_id) {
 169         case USB_DEVICE_ID_LOGITECH_DFP_WHEEL:
 170                 switch (usage->code) {
 171                 case ABS_X:
 172                         new_value = lg4ff_adjust_dfp_x_axis(value, entry->range);
 173                         input_event(field->hidinput->input, usage->type, usage->code, new_value);
 174                         return 1;
 175                 default:
 176                         return 0;
 177                 }
 178         default:
 179                 return 0;
 180         }
 181 }
 182
 183 static int hid_lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 184 {
 185         struct hid_device *hid = input_get_drvdata(dev);
 186         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 187         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 188         __s32 *value = report->field[0]->value;
 189         int x;
 190
 191 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 192
 193         switch (effect->type) {
 194         case FF_CONSTANT:
 195                 x = effect->u.ramp.start_level + 0x80;  /* 0x80 is no force */
 196                 CLAMP(x);
 197                 value[0] = 0x11;        /* Slot 1 */
 198                 value[1] = 0x08;
 199                 value[2] = x;
 200                 value[3] = 0x80;
 201                 value[4] = 0x00;
 202                 value[5] = 0x00;
 203                 value[6] = 0x00;
 204
 205                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 206                 break;
 207         }
 208         return 0;
 209 }
 210
 211 /* Sends default autocentering command compatible with
 212  * all wheels except Formula Force EX */
 213 static void hid_lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 214 {
 215         struct hid_device *hid = input_get_drvdata(dev);
 216         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 217         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 218         __s32 *value = report->field[0]->value;
 219
 220         value[0] = 0xfe;
 221         value[1] = 0x0d;
 222         value[2] = magnitude >> 13;
 223         value[3] = magnitude >> 13;
 224         value[4] = magnitude >> 8;
 225         value[5] = 0x00;
 226         value[6] = 0x00;
 227
 228         usbhid_submit_report(hid, report, USB_DIR_OUT);
 229 }
 230
 231 /* Sends autocentering command compatible with Formula Force EX */
 232 static void hid_lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 233 {
 234         struct hid_device *hid = input_get_drvdata(dev);
 235         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 236         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 237         __s32 *value = report->field[0]->value;
 238         magnitude = magnitude * 90 / 65535;
 239
 240         value[0] = 0xfe;
 241         value[1] = 0x03;
 242         value[2] = magnitude >> 14;
 243         value[3] = magnitude >> 14;
 244         value[4] = magnitude;
 245         value[5] = 0x00;
 246         value[6] = 0x00;
 247
 248         usbhid_submit_report(hid, report, USB_DIR_OUT);
 249 }
 250
 251 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 252 static void hid_lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 253 {
 254         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 255         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 256         __s32 *value = report->field[0]->value;
 257
 258         dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 259
 260         value[0] = 0xf8;
 261         value[1] = 0x81;
 262         value[2] = range & 0x00ff;
 263         value[3] = (range & 0xff00) >> 8;
 264         value[4] = 0x00;
 265         value[5] = 0x00;
 266         value[6] = 0x00;
 267
 268         usbhid_submit_report(hid, report, USB_DIR_OUT);
 269 }
 270
 271 /* Sends commands to set range compatible with Driving Force Pro wheel */
 272 static void hid_lg4ff_set_range_dfp(struct hid_device *hid, __u16 range)
 273 {
 274         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 275         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 276         int start_left, start_right, full_range;
 277         __s32 *value = report->field[0]->value;
 278
 279         dbg_hid("Driving Force Pro: setting range to %u\n", range);
 280
 281         /* Prepare "coarse" limit command */
 282         value[0] = 0xf8;
 283         value[1] = 0x00;        /* Set later */
 284         value[2] = 0x00;
 285         value[3] = 0x00;
 286         value[4] = 0x00;
 287         value[5] = 0x00;
 288         value[6] = 0x00;
 289
 290         if (range > 200) {
 291                 report->field[0]->value[1] = 0x03;
 292                 full_range = 900;
 293         } else {
 294                 report->field[0]->value[1] = 0x02;
 295                 full_range = 200;
 296         }
 297         usbhid_submit_report(hid, report, USB_DIR_OUT);
 298
 299         /* Prepare "fine" limit command */
 300         value[0] = 0x81;
 301         value[1] = 0x0b;
 302         value[2] = 0x00;
 303         value[3] = 0x00;
 304         value[4] = 0x00;
 305         value[5] = 0x00;
 306         value[6] = 0x00;
 307
 308         if (range == 200 || range == 900) {     /* Do not apply any fine limit */
 309                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 310                 return;
 311         }
 312
 313         /* Construct fine limit command */
 314         start_left = (((full_range - range + 1) * 2047) / full_range);
 315         start_right = 0xfff - start_left;
 316
 317         value[2] = start_left >> 4;
 318         value[3] = start_right >> 4;
 319         value[4] = 0xff;
 320         value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 321         value[6] = 0xff;
 322
 323         usbhid_submit_report(hid, report, USB_DIR_OUT);
 324 }
 325
 326 static void hid_lg4ff_switch_native(struct hid_device *hid, const struct lg4ff_native_cmd *cmd)
 327 {
 328         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 329         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 330         __u8 i, j;
 331
 332         j = 0;
 333         while (j < 7*cmd->cmd_num) {
 334                 for (i = 0; i < 7; i++)
 335                         report->field[0]->value[i] = cmd->cmd[j++];
 336
 337                 usbhid_submit_report(hid, report, USB_DIR_OUT);
 338         }
 339 }
 340
 341 /* Read current range and display it in terminal */
 342 static ssize_t lg4ff_range_show(struct device *dev, struct device_attribute *attr, char *buf)
 343 {
 344         struct hid_device *hid = to_hid_device(dev);
 345         struct lg4ff_device_entry *entry;
 346         struct lg_drv_data *drv_data;
 347         size_t count;
 348
 349         drv_data = hid_get_drvdata(hid);
 350         if (!drv_data) {
 351                 hid_err(hid, "Private driver data not found!\n");
 352                 return 0;
 353         }
 354
 355         entry = drv_data->device_props;
 356         if (!entry) {
 357                 hid_err(hid, "Device properties not found!\n");
 358                 return 0;
 359         }
 360
 361         count = scnprintf(buf, PAGE_SIZE, "%u\n", entry->range);
 362         return count;
 363 }
 364
 365 /* Set range to user specified value, call appropriate function
 366  * according to the type of the wheel */
 367 static ssize_t lg4ff_range_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 368 {
 369         struct hid_device *hid = to_hid_device(dev);
 370         struct lg4ff_device_entry *entry;
 371         struct lg_drv_data *drv_data;
 372         __u16 range = simple_strtoul(buf, NULL, 10);
 373
 374         drv_data = hid_get_drvdata(hid);
 375         if (!drv_data) {
 376                 hid_err(hid, "Private driver data not found!\n");
 377                 return 0;
 378         }
 379
 380         entry = drv_data->device_props;
 381         if (!entry) {
 382                 hid_err(hid, "Device properties not found!\n");
 383                 return 0;
 384         }
 385
 386         if (range == 0)
 387                 range = entry->max_range;
 388
 389         /* Check if the wheel supports range setting
 390          * and that the range is within limits for the wheel */
 391         if (entry->set_range != NULL && range >= entry->min_range && range <= entry->max_range) {
 392                 entry->set_range(hid, range);
 393                 entry->range = range;
 394         }
 395
 396         return count;
 397 }
 398
 399 #ifdef CONFIG_LEDS_CLASS
 400 static void lg4ff_set_leds(struct hid_device *hid, __u8 leds)
 401 {
 402         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 403         struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 404         __s32 *value = report->field[0]->value;
 405
 406         value[0] = 0xf8;
 407         value[1] = 0x12;
 408         value[2] = leds;
 409         value[3] = 0x00;
 410         value[4] = 0x00;
 411         value[5] = 0x00;
 412         value[6] = 0x00;
 413         usbhid_submit_report(hid, report, USB_DIR_OUT);
 414 }
 415
 416 static void lg4ff_led_set_brightness(struct led_classdev *led_cdev,
 417                         enum led_brightness value)
 418 {
 419         struct device *dev = led_cdev->dev->parent;
 420         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 421         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 422         struct lg4ff_device_entry *entry;
 423         int i, state = 0;
 424
 425         if (!drv_data) {
 426                 hid_err(hid, "Device data not found.");
 427                 return;
 428         }
 429
 430         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 431
 432         if (!entry) {
 433                 hid_err(hid, "Device properties not found.");
 434                 return;
 435         }
 436
 437         for (i = 0; i < 5; i++) {
 438                 if (led_cdev != entry->led[i])
 439                         continue;
 440                 state = (entry->led_state >> i) & 1;
 441                 if (value == LED_OFF && state) {
 442                         entry->led_state &= ~(1 << i);
 443                         lg4ff_set_leds(hid, entry->led_state);
 444                 } else if (value != LED_OFF && !state) {
 445                         entry->led_state |= 1 << i;
 446                         lg4ff_set_leds(hid, entry->led_state);
 447                 }
 448                 break;
 449         }
 450 }
 451
 452 static enum led_brightness lg4ff_led_get_brightness(struct led_classdev *led_cdev)
 453 {
 454         struct device *dev = led_cdev->dev->parent;
 455         struct hid_device *hid = container_of(dev, struct hid_device, dev);
 456         struct lg_drv_data *drv_data = hid_get_drvdata(hid);
 457         struct lg4ff_device_entry *entry;
 458         int i, value = 0;
 459
 460         if (!drv_data) {
 461                 hid_err(hid, "Device data not found.");
 462                 return LED_OFF;
 463         }
 464
 465         entry = (struct lg4ff_device_entry *)drv_data->device_props;
 466
 467         if (!entry) {
 468                 hid_err(hid, "Device properties not found.");
 469                 return LED_OFF;
 470         }
 471
 472         for (i = 0; i < 5; i++)
 473                 if (led_cdev == entry->led[i]) {
 474                         value = (entry->led_state >> i) & 1;
 475                         break;
 476                 }
 477
 478         return value ? LED_FULL : LED_OFF;
 479 }
 480 #endif
 481
 482 int lg4ff_init(struct hid_device *hid)
 483 {
 484         struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 485         struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
 486         struct input_dev *dev = hidinput->input;
 487         struct hid_report *report;
 488         struct hid_field *field;
 489         struct lg4ff_device_entry *entry;
 490         struct lg_drv_data *drv_data;
 491         struct usb_device_descriptor *udesc;
 492         int error, i, j;
 493         __u16 bcdDevice, rev_maj, rev_min;
 494
 495         /* Find the report to use */
 496         if (list_empty(report_list)) {
 497                 hid_err(hid, "No output report found\n");
 498                 return -1;
 499         }
 500
 501         /* Check that the report looks ok */
 502         report = list_entry(report_list->next, struct hid_report, list);
 503         if (!report) {
 504                 hid_err(hid, "NULL output report\n");
 505                 return -1;
 506         }
 507
 508         field = report->field[0];
 509         if (!field) {
 510                 hid_err(hid, "NULL field\n");
 511                 return -1;
 512         }
 513
 514         /* Check what wheel has been connected */
 515         for (i = 0; i < ARRAY_SIZE(lg4ff_devices); i++) {
 516                 if (hid->product == lg4ff_devices[i].product_id) {
 517                         dbg_hid("Found compatible device, product ID %04X\n", lg4ff_devices[i].product_id);
 518                         break;
 519                 }
 520         }
 521
 522         if (i == ARRAY_SIZE(lg4ff_devices)) {
 523                 hid_err(hid, "Device is not supported by lg4ff driver. If you think it should be, consider reporting a bug to"
 524                              "LKML, Simon Wood <simon@mungewell.org> or Michal Maly <madcatxster@gmail.com>\n");
 525                 return -1;
 526         }
 527
 528         /* Attempt to switch wheel to native mode when applicable */
 529         udesc = &(hid_to_usb_dev(hid)->descriptor);
 530         if (!udesc) {
 531                 hid_err(hid, "NULL USB device descriptor\n");
 532                 return -1;
 533         }
 534         bcdDevice = le16_to_cpu(udesc->bcdDevice);
 535         rev_maj = bcdDevice >> 8;
 536         rev_min = bcdDevice & 0xff;
 537
 538         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_WHEEL) {
 539                 dbg_hid("Generic wheel detected, can it do native?\n");
 540                 dbg_hid("USB revision: %2x.%02x\n", rev_maj, rev_min);
 541
 542                 for (j = 0; j < ARRAY_SIZE(lg4ff_revs); j++) {
 543                         if (lg4ff_revs[j].rev_maj == rev_maj && lg4ff_revs[j].rev_min == rev_min) {
 544                                 hid_lg4ff_switch_native(hid, lg4ff_revs[j].command);
 545                                 hid_info(hid, "Switched to native mode\n");
 546                         }
 547                 }
 548         }
 549
 550         /* Set supported force feedback capabilities */
 551         for (j = 0; lg4ff_devices[i].ff_effects[j] >= 0; j++)
 552                 set_bit(lg4ff_devices[i].ff_effects[j], dev->ffbit);
 553
 554         error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);
 555
 556         if (error)
 557                 return error;
 558
 559         /* Check if autocentering is available and
 560          * set the centering force to zero by default */
 561         if (test_bit(FF_AUTOCENTER, dev->ffbit)) {
 562                 if (rev_maj == FFEX_REV_MAJ && rev_min == FFEX_REV_MIN) /* Formula Force EX expects different autocentering command */
 563                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_ffex;
 564                 else
 565                         dev->ff->set_autocenter = hid_lg4ff_set_autocenter_default;
 566
 567                 dev->ff->set_autocenter(dev, 0);
 568         }
 569
 570         /* Get private driver data */
 571         drv_data = hid_get_drvdata(hid);
 572         if (!drv_data) {
 573                 hid_err(hid, "Cannot add device, private driver data not allocated\n");
 574                 return -1;
 575         }
 576
 577         /* Initialize device properties */
 578         entry = kzalloc(sizeof(struct lg4ff_device_entry), GFP_KERNEL);
 579         if (!entry) {
 580                 hid_err(hid, "Cannot add device, insufficient memory to allocate device properties.\n");
 581                 return -ENOMEM;
 582         }
 583         drv_data->device_props = entry;
 584
 585         entry->product_id = lg4ff_devices[i].product_id;
 586         entry->min_range = lg4ff_devices[i].min_range;
 587         entry->max_range = lg4ff_devices[i].max_range;
 588         entry->set_range = lg4ff_devices[i].set_range;
 589
 590         /* Create sysfs interface */
 591         error = device_create_file(&hid->dev, &dev_attr_range);
 592         if (error)
 593                 return error;
 594         dbg_hid("sysfs interface created\n");
 595
 596         /* Set the maximum range to start with */
 597         entry->range = entry->max_range;
 598         if (entry->set_range != NULL)
 599                 entry->set_range(hid, entry->range);
 600
 601 #ifdef CONFIG_LEDS_CLASS
 602         /* register led subsystem - G27 only */
 603         entry->led_state = 0;
 604         for (j = 0; j < 5; j++)
 605                 entry->led[j] = NULL;
 606
 607         if (lg4ff_devices[i].product_id == USB_DEVICE_ID_LOGITECH_G27_WHEEL) {
 608                 struct led_classdev *led;
 609                 size_t name_sz;
 610                 char *name;
 611
 612                 lg4ff_set_leds(hid, 0);
 613
 614                 name_sz = strlen(dev_name(&hid->dev)) + 8;
 615
 616                 for (j = 0; j < 5; j++) {
 617                         led = kzalloc(sizeof(struct led_classdev)+name_sz, GFP_KERNEL);
 618                         if (!led) {
 619                                 hid_err(hid, "can't allocate memory for LED %d\n", j);
 620                                 goto err;
 621                         }
 622
 623                         name = (void *)(&led[1]);
 624                         snprintf(name, name_sz, "%s::RPM%d", dev_name(&hid->dev), j+1);
 625                         led->name = name;
 626                         led->brightness = 0;
 627                         led->max_brightness = 1;
 628                         led->brightness_get = lg4ff_led_get_brightness;
 629                         led->brightness_set = lg4ff_led_set_brightness;
 630
 631                         entry->led[j] = led;
 632                         error = led_classdev_register(&hid->dev, led);
 633
 634                         if (error) {
 635                                 hid_err(hid, "failed to register LED %d. Aborting.\n", j);
 636 err:
 637                                 /* Deregister LEDs (if any) */
 638                                 for (j = 0; j < 5; j++) {
 639                                         led = entry->led[j];
 640                                         entry->led[j] = NULL;
 641                                         if (!led)
 642                                                 continue;
 643                                         led_classdev_unregister(led);
 644                                         kfree(led);
 645                                 }
 646                                 goto out;       /* Let the driver continue without LEDs */
 647                         }
 648                 }
 649         }
 650 out:
 651 #endif
 652         hid_info(hid, "Force feedback support for Logitech Gaming Wheels\n");
 653         return 0;
 654 }
 655
 656
 657
 658 int lg4ff_deinit(struct hid_device *hid)
 659 {
 660         struct lg4ff_device_entry *entry;
 661         struct lg_drv_data *drv_data;
 662
 663         device_remove_file(&hid->dev, &dev_attr_range);
 664
 665         drv_data = hid_get_drvdata(hid);
 666         if (!drv_data) {
 667                 hid_err(hid, "Error while deinitializing device, no private driver data.\n");
 668                 return -1;
 669         }
 670         entry = drv_data->device_props;
 671         if (!entry) {
 672                 hid_err(hid, "Error while deinitializing device, no device properties data.\n");
 673                 return -1;
 674         }
 675
 676 #ifdef CONFIG_LEDS_CLASS
 677         {
 678                 int j;
 679                 struct led_classdev *led;
 680
 681                 /* Deregister LEDs (if any) */
 682                 for (j = 0; j < 5; j++) {
 683
 684                         led = entry->led[j];
 685                         entry->led[j] = NULL;
 686                         if (!led)
 687                                 continue;
 688                         led_classdev_unregister(led);
 689                         kfree(led);
 690                 }
 691         }
 692 #endif
 693
 694         /* Deallocate memory */
 695         kfree(entry);
 696
 697         dbg_hid("Device successfully unregistered\n");
 698         return 0;
 699 }